Gtr plenum

[Kaido_RR]

hey,

I recently pick myself up a I/C, now im getting around to do the piping sometime this week. now after reading how good the gtr plenum is and seeing one on a neo rb25, i was wondering does anyone know anyone in australia (or perth) that would be able to make up an adoptor plate to suit an r33 rb25?

thanks michael

[Kaido_RR]

also, if i pick up a gtr fuel rail, how hard would it be to make it fit with the plenum? would it need moding

[Baz]

Errr... I have a n00b question to ask. What does FMIC stand for?

[Kaido_RR]

Errr... I have a n00b question to ask. What does FMIC stand for?

ahaha my bad, i ment ic

[tang0]

Front Mounted InterCooler

[Sydneykid]

Do search for heavens sake, this question has been asked soooooo many times.

F = Front

M = Mount

I = Inter

C = cooler

[HKS34R]

hey,

I recently pick myself up a I/C, now im getting around to do the piping sometime this week. now after reading how good the gtr plenum is and seeing one on a neo rb25, i was wondering does anyone know anyone in australia (or perth) that would be able to make up an adoptor plate to suit an r33 rb25?

thanks michael

Interesting. Was this a standard GTR plenum on the NEO or an aftermarket one (i.e Greddy). Anyone know how hard these would be to fit and whether it would be worth the effort, I mean, outside of making intercooler piping easier. The throttle cable would have to be adapted to suit, but anything else??

[Kaido_RR]

Brett, the gtr plenum was on an r34 gt-t 4dr (if u watch d1, it is the blitz r34 4dr, driven by Ken Nomura)

i just did abit of seraching and found that a plate or spacer would be needed to be made to fit inbetween the plenum and the rb25 head. i have contact someone in perth which does ic piping and ask him if he could possable do it, i will get back to you once i have got my reply.

also i read that the gtr fuel rail, will fit also pefrectly?

[R324D]

Anyone know how hard these would be to fit and whether it would be worth the effort

I fealt top end increased but you lose power down low, all in all if I owned another Skyline would I do it again.........No.......

As mentioned run a search on past threads, here is 2, mainly about 32's but 33's are bought up...

http://www.skylinesaustralia.com/forums/sh...ead.php?t=49852

http://www.skylinesaustralia.com/forums/sh...ead.php?t=36518

[HKS34R]

Cheers. So I'm guessing it was an aftermarket Blitz GTR plenum and not a standard GTR plenum?? I'm assuming that the NEO was still a RB25 (head etc).

Any idea why they would do that instead of using a plenum built for the RB25??

[Kaido_RR]

Brett, it was a stock gtr plenum, i have been told and read many times that the responds that the gtr plenum is second to none

[Sydneykid]

Brett, it was a stock gtr plenum, i have been told and read many times that the responds that the gtr plenum is second to none

on an RB26, YES with the multiple throttle bodies.

on an RB25, NO...........

[Kaido_RR]

then Sydneykid, why is it uses on the blitz r34 drift car? and what is the problem putting it on a rb25?

i really would like to know, as i have the chance to buy the plenum very soon and if it isnt going to work well on the rb25 there is no point me getting it

[Sydneykid]

then Sydneykid, why is it uses on the blitz r34 drift car? and what is the problem putting it on a rb25?  

i really would like to know, as i have the chance to buy the plenum very soon and if it isnt going to work well on the rb25 there is no point me getting it

Maybe it has an RB26 in it. Or an RB26 cylinder head. Or maybe it was done so they could get the extra throttle response from the multiple throttle bodies. Drifters need throttle response much more than they need excessive power, particularly long wheelbase heavy sedans. One thing is for sure, there is far more to it than just the plenum.

[Kaido_RR]

so SK, if i was to do it on my fairly stock rb25? the gains would be almost zero? if i dont lose any power, responds i will still do it as i want the piping shorter

[R324D]

on an RB26, YES with the multiple throttle bodies.

on an RB25, NO...........

:uh-huh:

[Kaido_RR]

sorry about all the question SK, but u are like one of the only people i respect and all you info is top

[R324D]

You will regret it. I had it done to mine, although it was a RB20 not a 25 I don't think it will make that much of a difference from the research I did on it....

It may look the goods..... but still, I wouldn't if I were you.

[HKS34R]

so SK, if i was to do it on my fairly stock rb25? the gains would be almost zero? if i dont lose any power, responds i will still do it as i want the piping shorter

Why not go for an aftermarket plenum made for the RB25?? At least then you know some R&D has gone into its design to make sure it works.

[Sydneykid]

so SK, if i was to do it on my fairly stock rb25? the gains would be almost zero? if i dont loser any power, responds i will still do it as i want the piping shorter

Forget about GAINS, you are looking at LOSSES. Have a read.....

Some info on the RB20 with RB26 inlet as per Zoom Magazine edition 64 and edition 62;

This picture shows the RB26 plenum being test fitted up to the cut and welded RB20 inlet. The throttle bodies go between the RB26 plenum and the modified (shortened) RB20 inlet but are not shown in this photo.

This is a picture of the RB26 plenum, RB26 throttle bodies and RB20 shortened inlet on the RB20.

Using a 120 degree bend at the throttle body reduces the difference in intercooler pipework by more than 50%, to a bit less than 1 litre using 75 mm pipework.

To work out the throttle response difference the calculations are easy;

2500 cc X 5000 rpm / 2 (4 stroke) at 1.3 bar = 135 litres per second

So a saving of 1 litre represents less than 0.005 of a second

That's not a lot of lag to save with reduced pipework.

So using an RB26 plenum and throttle bodies on anything other than an RB26 is not a good idea in my opinion. Especially when you consider the potential to loose throttle response due to poor airflow distribution is far greater than any minute shortening of the inlet pipework.

My 20 cents worth:cheers: